Battery booster



FIG. 1 is a front view thereof.

FIG. 2 is a rear view thereof.

FIG. 3 is a top view thereof.

FIG. 4 is a side view from the right of FIG. 3; and,

FIG. 5 is a side view from the left of FIG. 3. 

The ornamental design for said battery booster, as shown and described. 